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|
use std::fs::File;
use std::io;
use std::path::Path;
use encoding_rs::Encoding;
use grep::Grep;
use ignore::DirEntry;
use memmap::Mmap;
use termcolor::WriteColor;
use decoder::DecodeReader;
use decompressor::{self, DecompressionReader};
use pathutil::strip_prefix;
use printer::Printer;
use search_buffer::BufferSearcher;
use search_stream::{InputBuffer, Searcher};
use Result;
pub enum Work {
Stdin,
DirEntry(DirEntry),
}
pub struct WorkerBuilder {
grep: Grep,
opts: Options,
}
#[derive(Clone, Debug)]
struct Options {
mmap: bool,
encoding: Option<&'static Encoding>,
after_context: usize,
before_context: usize,
byte_offset: bool,
count: bool,
count_matches: bool,
files_with_matches: bool,
files_without_matches: bool,
eol: u8,
invert_match: bool,
line_number: bool,
max_count: Option<u64>,
no_messages: bool,
quiet: bool,
text: bool,
search_zip_files: bool
}
impl Default for Options {
fn default() -> Options {
Options {
mmap: false,
encoding: None,
after_context: 0,
before_context: 0,
byte_offset: false,
count: false,
count_matches: false,
files_with_matches: false,
files_without_matches: false,
eol: b'\n',
invert_match: false,
line_number: false,
max_count: None,
no_messages: false,
quiet: false,
text: false,
search_zip_files: false,
}
}
}
impl WorkerBuilder {
/// Create a new builder for a worker.
///
/// A reusable input buffer and a grep matcher are required, but there
/// are numerous additional options that can be configured on this builder.
pub fn new(grep: Grep) -> WorkerBuilder {
WorkerBuilder {
grep: grep,
opts: Options::default(),
}
}
/// Create the worker from this builder.
pub fn build(self) -> Worker {
let mut inpbuf = InputBuffer::new();
inpbuf.eol(self.opts.eol);
Worker {
grep: self.grep,
inpbuf: inpbuf,
decodebuf: vec![0; 8 * (1<<10)],
opts: self.opts,
}
}
/// The number of contextual lines to show after each match. The default
/// is zero.
pub fn after_context(mut self, count: usize) -> Self {
self.opts.after_context = count;
self
}
/// The number of contextual lines to show before each match. The default
/// is zero.
pub fn before_context(mut self, count: usize) -> Self {
self.opts.before_context = count;
self
}
/// If enabled, searching will print a 0-based offset of the
/// matching line (or the actual match if -o is specified) before
/// printing the line itself.
///
/// Disabled by default.
pub fn byte_offset(mut self, yes: bool) -> Self {
self.opts.byte_offset = yes;
self
}
/// If enabled, searching will print a count instead of each match.
///
/// Disabled by default.
pub fn count(mut self, yes: bool) -> Self {
self.opts.count = yes;
self
}
/// If enabled, searching will print the count of individual matches
/// instead of each match.
///
/// Disabled by default.
pub fn count_matches(mut self, yes: bool) -> Self {
self.opts.count_matches = yes;
self
}
/// Set the encoding to use to read each file.
///
/// If the encoding is `None` (the default), then the encoding is
/// automatically detected on a best-effort per-file basis.
pub fn encoding(mut self, enc: Option<&'static Encoding>) -> Self {
self.opts.encoding = enc;
self
}
/// If enabled, searching will print the path instead of each match.
///
/// Disabled by default.
pub fn files_with_matches(mut self, yes: bool) -> Self {
self.opts.files_with_matches = yes;
self
}
/// If enabled, searching will print the path of files without any matches.
///
/// Disabled by default.
pub fn files_without_matches(mut self, yes: bool) -> Self {
self.opts.files_without_matches = yes;
self
}
/// Set the end-of-line byte used by this searcher.
pub fn eol(mut self, eol: u8) -> Self {
self.opts.eol = eol;
self
}
/// If enabled, matching is inverted so that lines that *don't* match the
/// given pattern are treated as matches.
pub fn invert_match(mut self, yes: bool) -> Self {
self.opts.invert_match = yes;
self
}
/// If enabled, compute line numbers and prefix each line of output with
/// them.
pub fn line_number(mut self, yes: bool) -> Self {
self.opts.line_number = yes;
self
}
/// Limit the number of matches to the given count.
///
/// The default is None, which corresponds to no limit.
pub fn max_count(mut self, count: Option<u64>) -> Self {
self.opts.max_count = count;
self
}
/// If enabled, try to use memory maps for searching if possible.
pub fn mmap(mut self, yes: bool) -> Self {
self.opts.mmap = yes;
self
}
/// If enabled, error messages are suppressed.
///
/// This is disabled by default.
pub fn no_messages(mut self, yes: bool) -> Self {
self.opts.no_messages = yes;
self
}
/// If enabled, don't show any output and quit searching after the first
/// match is found.
pub fn quiet(mut self, yes: bool) -> Self {
self.opts.quiet = yes;
self
}
/// If enabled, search binary files as if they were text.
pub fn text(mut self, yes: bool) -> Self {
self.opts.text = yes;
self
}
/// If enabled, search through compressed files as well
pub fn search_zip_files(mut self, yes: bool) -> Self {
self.opts.search_zip_files = yes;
self
}
}
/// Worker is responsible for executing searches on file paths, while choosing
/// streaming search or memory map search as appropriate.
pub struct Worker {
grep: Grep,
inpbuf: InputBuffer,
decodebuf: Vec<u8>,
opts: Options,
}
impl Worker {
/// Execute the worker with the given printer and work item.
///
/// A work item can either be stdin or a file path.
pub fn run<W: WriteColor>(
&mut self,
printer: &mut Printer<W>,
work: Work,
) -> u64 {
let result = match work {
Work::Stdin => {
let stdin = io::stdin();
let stdin = stdin.lock();
self.search(printer, Path::new("<stdin>"), stdin)
}
Work::DirEntry(dent) => {
let mut path = dent.path();
if self.opts.search_zip_files
&& decompressor::is_compressed(path)
{
match DecompressionReader::from_path(path) {
Some(reader) => self.search(printer, path, reader),
None => {
return 0;
}
}
} else {
let file = match File::open(path) {
Ok(file) => file,
Err(err) => {
if !self.opts.no_messages {
eprintln!("{}: {}", path.display(), err);
}
return 0;
}
};
if let Some(p) = strip_prefix("./", path) {
path = p;
}
if self.opts.mmap {
self.search_mmap(printer, path, &file)
} else {
self.search(printer, path, file)
}
}
}
};
match result {
Ok(count) => {
count
}
Err(err) => {
if !self.opts.no_messages {
eprintln!(
|